Ubuntu compile opencv_contrib module

 

https://blog.csdn.net/ipfpm/article/details/81132144

[Ubuntu] Ubuntu download the Android SDK versions with the configuration android24

 

(1) installation ADNORID SDk environment

 https://developer.android.com/studio

1.1 Installation JAVA environment

https://cloud.tencent.com/developer/article/1162527

https://www.howtoing.com/how-to-install-java-with-apt-on-ubuntu-18-04

OpenJDK 8

Java 8 is long-term support version, although the Public Defender ended in January 2019, but still widely supported. To install the OpenJDK 8, execute the following command:

sudo apt install openjdk-8-jdk

This verification is installed

java -version

Can only install the JRE, you can execute sudo apt install openjdk-8-jre .

OpenJDK 10/11

Ubuntu repository contains a package Java 10 or 11 installation. Prior to September 2018, the package will be installed OpenJDK 10. Once Java 11 release, the package will install Java 11.

To install OpenJDK 10/11, execute the following command:

sudo apt install openjdk-11-jdk

To install the JRE only, use the following command:

sudo apt install openjdk-11-jre

Next, let's look at how to install Oracle's official JDK and JRE.

 

1.2 Configuration JAVA_HOME

Set JAVA_HOMEEnvironment Variables

Many programs written in Java using JAVA_HOMEenvironment variables to determine the Java installation location.

To set this environment variable, first determine if Java is installed. Use update-alternativesthe command:

$ sudo update-alternatives --config java

This command displays each installation and the installation path of Java:

There are 3 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ * 0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1101 auto mode 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1101 manual mode 2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode 3 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode Press <enter> to keep the current choice[*], or type selection number:

In this case, the mounting path is as follows:

1. OpenJDK 11 located /usr/lib/jvm/java-11-openjdk-amd64/bin/java.
2. OpenJDK 8 is located /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java.
3. Oracle Java 8 is located /usr/lib/jvm/java-8-oracle/jre/bin/java.

Copy the path from your desired installation. Then use nanoor your favorite text editor to open /etc/environment:

$ sudo nano /etc/environment

At the end of this file, add the following line, be sure to use your own copy of the path to replace the highlighted route:

/etc/environment

JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64/bin/java"

All users modify settings on this file system will JAVA_HOMEroute.

Save the file and exit the editor.

Now reload this file:

$ source /etc/environment

Verify that you have set the environment variable:

$ echo $JAVA_HOME

You will see the path just set:

/usr/lib/jvm/java-11-openjdk-amd64/bin/java

Other users need to execute commands source /etc/environmentor log off and log on to apply this setting.

 

1.3 Download

https://blog.csdn.net/opengl_es/article/details/80184519

After decompression, the emergence of tools directory, put it in an empty directory SDK to be installed, start the installation.

Second, the mounting assembly may be listed package

Use the shortcut keys CTRL + ALT + T to open the Console control terminal, go to the bin directory under the above extract from the tools directory, find sdkmanager,

Run the following command

./sdkmanager --list (../android list sdk obsolete)

Third, the mounting assembly package

Next, the contents of the column select PATH above installation, the following command:

$ ./sdkmanager "system-images;android-27;google_apis;x86"

./sdkmanager "double quotes is above path"

 

./sdkmanager  "system-images;android-28;google_apis;x86_64 "

 

 

2 compiled opencv and opencv_contrib

https://www.cnblogs.com/klchang/p/7563494.html